#include <iostream>
using namespace std; // std::cout

namespace first_space {
	void func() {
		cout << "Inside first_space " << endl;
	}
}
namespace second_space {
	void func() {
		cout << "Inside second_space " << endl;
	}
}
using namespace first_space; // first_space::func()
int main() {
	func();
	second_space::func(); //khong co using namespace second_space
	system("pause");
	return 0;
}